JP3237050B2 - Mortar-filled rebar joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar-filled rebar joint, and more particularly to a rebar joint of a cast-in-place concrete method which is a conventional method, and a precast (hereinafter referred to as PC).
The present invention relates to a mortar-filled rebar joint suitable for use in butting joints of rebars between PC beams among construction methods.

[0002]

2. Description of the Related Art In a conventional reinforced concrete structure,
In the cast-in-place concrete method called the conventional method, concrete is sequentially built by assembling reinforcing steel at site work and then concrete is built. on the other hand,
In the PC method, concrete panels and concrete columns, etc., in which reinforcing bars and joint sleeves are solidified in advance, are prepared, and concrete structures are constructed by sequentially connecting reinforcing bars protruding from the panels and the like to the joint sleeves. At the time of butt joining of the reinforcing bars of the beams, joining cannot be performed using this joint sleeve. This is because joint sleeves are presumed to be solidified and used integrally with concrete panels, etc., because the inner diameter is larger than the rebar diameter so that construction errors can be absorbed. If the mortar is used for the butt joint of the reinforcing bars, the reinforcing bars cannot be reliably fixed at the time of filling the mortar, so that the mortar effect is adversely affected.

[0003] Therefore, in the conventional cast-in-place concrete method and the PC method, when the reinforcing bars of the PC beams are butt-joined, a method of connecting the reinforcing bars in a straight line is as follows. Pressure welding method, butt welding method in which rebars are butt-welded, lap joint method in which rebars are overlapped and tied up with a piano wire and connected, couplers in which male threads are cut and connected to coupler joints in which female threads are cut and connected There is a joint method.

[0004]

However, in the above described conventional cast-in-place concrete method and the PC method, in the case of the butt joint of the reinforcing bars between the PC beams, a special device serving as a fire source is required in the case of the pressure welding method. However, in the field work, it is difficult to obtain high reliability and there is a need for skilled workers.In the case of the butt welding method, in addition to these, There is a problem that the groove processing is required. In addition, in the case of the lap joint method, a lap length of 20 to 40 times the rebar diameter is required, and the rebar becomes overcrowded due to the lamination, and concrete cannot be driven precisely, There is a problem that it is not suitable for rebar. Further, in the case of the coupler joint method, there is a problem that the position or the screw pitch between the reinforcing bar and the coupler joint is difficult to match, and the reinforcing bar or the coupler joint must be rotated to screw-fit. In addition, in the butt joint of the reinforcing bars between the PC beams, there is a problem that a secondary stress generated due to welding heat, torque of a coupler joint, or the like disrupts the positional relationship between the PC beams.

The present invention has been made in order to solve such a problem, and requires a special heating device and pre-processing even in a conventional cast-in-place concrete method and a butt joint of reinforcing bars between PC beams. High reliability can be ensured even by non-technical workers, superposition of rebars is eliminated, concrete can be driven in densely, and it can be applied to large-diameter rebars. It is an object of the present invention to provide a mortar-filled rebar joint that does not require and does not generate secondary stress during joining, in other words, a mortar-filled rebar joint that can join rebars very easily and reliably.

[0006]

In order to solve the above-mentioned problems, a mortar-filled rebar joint according to the present invention comprises a metal tubular sleeve, which is inserted through insertion ports provided at both ends. A support projection that is inserted from the outside between the support points of the support projections, the support projection being provided on the inner wall surface and supporting the reinforcement at least two support points axially separated from each other, It is equipped with fixing members such as bolts, taper pins, and spring pins for pressing and fixing the reinforcing bar to the support projection side from the opposite side, and an injection port for injecting mortar into the inside, and filling the mortar from the injection port to fill the mortar. The reinforcement is joined by solidification.

[0007] support protrusion may also be supported by one another to match the axis of the reinforcing bar which is loosely inserted from the interpolation inlet, or is matched with the axial center of the axis and the tubular sleeve rebar.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above-mentioned mortar-filled rebar joint, the tubular sleeve allows the rebar to be loosely inserted from the insertion ports provided at both ends and protrudes from the inner wall surface to separate the rebar in the axial direction. A support projection that is supported from the side by at least two support points, and a bolt, a taper pin, and a spring that are inserted between the support points of the support projection from outside and press and fix the reinforcing bar to the support projection side from the opposite side of the support projection. Since a fixing member such as a pin is provided, first, the two rebars to be joined are loosely inserted from both the insertion openings of the tubular sleeve, and then the fixing members corresponding to the respective rebars are pressed. Press each against the support projection. As a result, each rebar is fixed by the support point of the support protrusion and the fixing member disposed on the opposite side. Since the fixing member is provided between the support points of the support protrusions, the rebar is fixed in an extremely stable state.

[0009] support protrusion and each other to match the axis of the reinforcing bar which is loosely inserted from the interpolation inlet, through the support to match the axis of the axis and the tubular sleeve of reinforcing bars, reinforcing bar or tubular sleeves one another Is fixed with its axis centered.

[0010]

FIG. 1 to FIG. 12 show an embodiment of the present invention.
This will be described in detail with reference to FIG. FIG. 1 shows the appearance of a mortar-filled reinforcing bar joint 1 according to the present invention. Specifically, as shown in FIG. 2, the main body of the mortar-filled rebar joint 1 is a tubular sleeve 2 made of a metal tube, and insertion ports 3 and 3 are provided at both ends of the tubular sleeve 2. This insertion slot 3,
Reference numerals 3 each have a diameter smaller than the inner diameter of the tubular sleeve 2, but each have a diameter through which the reinforcing bars 20, 20 can be loosely inserted. On the inner wall surface of the tubular sleeve 2, support projections 5, 5,
6 and 6 are protruded respectively. The support projections 5, 6 cooperate to form two support points. The support projections 5, 5, 6, and 6 are shown in FIG.
As shown in FIG. 3, the reinforcing members 20 are formed by annular walls having circular openings eccentric from the axis of the tubular sleeve 2, respectively. When the reinforcing bars 20, 20 are pressed in directions opposite to the eccentric direction of the circular openings, respectively, , 20 and the tubular sleeve 2 are supported from the side with their axes aligned with each other.

Here, the outer support projections 5, 5 simultaneously form the above-described insertion openings 3, 3 of the tubular sleeve 2, respectively. Bolt holes 25, 25 are formed between the respective support protrusions 5, 6 of the tubular sleeve 2, and bolts 7 are screwed into the bolt holes from outside the tubular sleeve 2, respectively. The bolt 7 presses the rebar 20 from the side opposite to the support protrusions 5, 6 toward the support protrusions 5, 6 to fix it. An injection port 8 for injecting the mortar 21 into the tubular sleeve 2; and an exhaust port 9 that can be used for confirming the completion of the filling as described later while evacuating the mortar 21 during the filling to facilitate the filling operation. Are drilled respectively. The location where the inlet 8 and the outlet 9 are provided is not limited to the position shown in FIG. 2, but may be any location as long as it is a side wall surface between the insertion ports 3. It is desirable to arrange the mortar 21 as close as possible and to separate the mortar 21 as much as possible.

An annular projection 10 protrudes from the inner wall surface of the tubular sleeve 2. It is desirable that a plurality of the annular projections 10 be provided. The inner support projections 6, 6 function as one of the annular projections 10. Although the heights of the annular projections 10 may be different from each other, the annular projections 10 other than the support projections 6 and 6 are formed lower than the support projections 5, 5, 6 and 6. A reinforcing bar stopper projection 11 is provided on the central inner wall surface of the tubular sleeve 2. The rebar stop projections 11 prevent the rebars 20, 20 from penetrating further into the tubular sleeve 2. An annular seal 1 made of an elastic material is provided outside the insertion ports 3 and 3 of the tubular sleeve 2.
Temporarily attach 2 and 12, respectively.

The reinforcing bars 20 to be joined may have different diameters. In this case, the heights of the support projections 5, 5, 6, and 6 are set to the respective reinforcing bars 20. , 20 so that the axes of the rebars 20, 20 and the tubular sleeve 2 coincide with each other. Next, the method of use and functions of the present mortar-filled rebar joint 1 will be described.

The seals 12, 12 temporarily attached to the outside of the insertion openings 3, 3 of the tubular sleeve 2 are removed and fitted into the reinforcing bars 20, 20 to be joined, respectively.
20 is inserted from the insertion openings 3 and 3 of the tubular sleeve 2. Since the insertion openings 3 and 3 allow the rebars 20 and 20 to be loosely inserted, respectively, the insertion operation is easy. In addition, the reinforcing bar retaining projection 11 is
0,20 prevents further penetration into the tubular sleeve 2, so that the tubular sleeve 2 naturally reinforces the reinforcing bars 20, 20.
Are arranged at substantially the center between them. And rebar 2
After confirming that 0 and 20 have been inserted sufficiently deeper than the inner support projections 6 and 6, respectively, the bolts 7 and 7 are tightened and the rebars 20 and 20 are placed on the side of the support projections 5, 5, 6, and 6. Press each one. Thereby, the rebars 20, 20 are supported by the support projections 5,
The bolts 7, 7 arranged on the opposite side of the bolts 5, 6, 6 and the bolts 7, 7 are fixed so that their axes coincide with each other. Also,
The axes of the rebars 20, 20 and the axis of the tubular sleeve 2 also match. Since the bolts 7 are provided between the support projections 5 and 6 serving as support points, the rebars 20 and 20 are fixed in an extremely stable state. The seals 12, 12 are fitted to the outside of the insertion openings 3, 3 of the tubular sleeve 2, respectively.

A mortar 21 is injected from the injection port 8 and filled in the tubular sleeve 2. Since the air is exhausted from the exhaust port 9, the mortar 21 can be easily and reliably filled. Further, by confirming that the mortar 21 overflows from the exhaust port 9, it is possible to confirm whether or not the mortar 21 is completely filled. Seals 12 prevent leakage of mortar 21. The joining operation is completed after the mortar 21 is solidified. Since the insertion ports 3 and 3 are each formed to have a smaller diameter than the inner diameter of the tubular sleeve 2, the mortar 21 is fixed, and the annular projection 10 enhances the engagement between the tubular sleeve 2 and the mortar 21. Reinforcing bars 20, 20
Are fixed in a stable state by the supporting projections 5, 5, 6, 6 which are supporting points and the bolts 7, 7 arranged on the opposite side, so that the reinforcing bars 20,
The mortar effect does not decrease due to the movement of the shaft 20, and the axes of the reinforcing bars 20, 20 and the tubular sleeve 2 do not deviate from each other. As described above, the mortar-filled rebar joint 1 is used in a conventional cast-in-place concrete method as shown in FIG. 8 and in a butt joint of the rebars 20, 20 between the PC beams 22 as shown in FIG. , Rebar 2
0 and 20 can be joined very simply and reliably.

In the above-described embodiment, the reinforcing bars 2 on both sides are used.
Although the support projections 5, 6 and the bolt 7 are provided for each of the reinforcing bars 20, 0, 20, the present invention is not limited to this. Alternatively, the two rebars 20, 20 may be joined. Further, the support projections 5, 5, 6, and 6 are formed by an annular wall having a circular opening eccentric from the axis of the tubular sleeve 2,
In addition, while the circular openings of the support protrusions 5 and 5 also serve as the insertion openings 3 and 3, the support protrusions 6 and 6 also function as the annular protrusions 10, respectively, but are not limited thereto. As shown in FIGS. 4 and 5, the support protrusion may be provided in an independent form on the inner wall surface of the tubular sleeve 2, and the shape thereof is not annular but the support protrusion 15 protrudes from a part of the inner wall surface, Support projection 1 whose axial surface is inclined
6,17. However, it is necessary for the support projection to have a support surface having a receiving shape such that the rebar 20 does not slide and move laterally when pressed by the bolt 7, as shown in FIGS. 3 and 4, for example. is there.

[0017]

The fixing member does not need to be limited to a bolt.
0 and FIG. 11, as shown in FIG.
The tapered pin 23 may be driven into the tubular sleeve 2 from the outer peripheral surface. FIG. 10 shows a case in which a pin hole 24 is formed in the outer peripheral surface of the tubular sleeve 2 in the radial direction toward the axis, and the rebar 20 is pressed against the support protrusion 15 with the tip of the tapered pin 23 driven into the pin hole, and FIG. Sleeve 2
A pin hole 24 in the chord direction with respect to the axis is formed on the outer peripheral surface of the reinforcing bar 2 on the side peripheral surface of the tapered pin 23 driven into the pin hole.
0 is pressed against the support projection 15 and fixed. Instead of the tapered pin, a spring pin 26 obtained by rolling a leaf spring shown in FIG. 12 into a pin shape may be used as a fixing member.

[0019]

As described above in detail, in the mortar-filled rebar joint according to the present invention, the tubular sleeve is provided on at least two support points projecting from the inner wall surface to separate the rebar in the axial direction from the side. A supporting projection to be supported, a bolt, a taper pin, which is screwed in from the outside between the supporting points of the supporting projection and presses and fixes the rebar to the supporting projection side from the opposite side of the supporting projection;
A fixing member such as a spring pin is provided, and each rebar is extremely easily and reliably fixed in a stable state by a supporting point of the support protrusion and a fixing member arranged on the opposite side. In the cast-in-place concrete method and the butt-joining of reinforcing bars between PC beams, special heating equipment and pre-processing are not required, high reliability can be secured even for non-technical workers, and superposition of reinforcing bars is eliminated. It is possible to drive concrete concrete densely and apply it to a large-diameter rebar, so that there is no need for a troublesome work of screwing a rebar and a joint, and it is possible to produce effects such as not generating secondary stress at the time of joining. In other words, the present mortar-filled rebar joint has the special effect that the rebar can be joined very simply and reliably in the conventional cast-in-place concrete method and the butt joint of rebars between PC beams. To play.

[Brief description of the drawings]

FIG. 1 is a front view showing the appearance of a mortar-filled rebar joint according to the present invention.

FIG. 2 is a cross-sectional front view showing an internal configuration of the mortar-filled rebar joint of FIG.

FIG. 3 is a cross-sectional side view showing the mortar-filled rebar joint as viewed from section line AA in FIG. 2;

FIG. 4 is a sectional side view showing another configuration of the tubular sleeve of FIG. 2;

FIG. 5 is a sectional front view showing another configuration of the tubular sleeve of FIG. 2;

FIG. 6 is a reference diagram showing a configuration different from the present invention .

FIG. 7 is a reference diagram showing another configuration different from the present invention .

FIG. 8 is a front view showing a use state of the mortar-filled rebar joint of FIG. 1;

FIG. 9 is a front view showing another state of use of the mortar-filled rebar joint of FIG. 1;

FIG. 10 is a cross-sectional side view showing a configuration of a tubular sleeve of another embodiment.

FIG. 11 is a cross-sectional side view showing a configuration of a tubular sleeve of still another embodiment.

FIG. 12 is a perspective view of a spring pin used as a fixing member.

[Explanation of symbols]

1 mortar filled rebar joint, 2 tubular sleeve,
3 insertion slot, 5,6 support projection, 7 bolt, 8
Inlet, 9 exhaust port, 10 annular projection, 11
Reinforcing bar protrusions, 12 seals, 15, 16, 1
7, 18, 19 support projections, 20 rebars, 21
Mortar, 22 PC beam, 23 taper pin,
24 pin holes, 25 bolt holes, 26 spring pins

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04C 5/00-5/20 E04G 21/12 105 F16B ^7/ 00-7/22

Claims (6)

(57) [Claims] 1. A metal tubular sleeve (2), said tubular sleeves having insertion openings (3, 3) arranged at both ends.
The support projections (5,6,1) that allow the reinforcing bars (20,20) to be loosely inserted from 3) and that are projected from the inner wall surface and support the reinforcing bars from the side at at least two support points separated in the axial direction.
5, 16 and 17 ) and a fixing member (7 ) which is inserted between the support points of the support projections from outside the tubular sleeve and presses and fixes the rebar against the support projections from the opposite side of the support projections. , 23, 26) and mortar (2
A mortar-filled rebar joint (1), comprising: an inlet (8) for injecting 1); and joining the rebar by injecting mortar from the inlet and filling and solidifying the mortar. 2. The support projection (5, 6, 15, 16, 1)
7 ) The mortar filling type according to claim 1 , wherein the reinforcing rods (20, 20) loosely inserted from the insertion openings (3, 3) are supported so that their axes are aligned with each other. Reinforcing joint (1). 3. The support projection (5, 6, 15, 16, 1)
7 ) The mortar-filled rebar joint (1) according to claim 1 or 2 , wherein the rebar (20) and the tubular sleeve (2) are supported so that the axis thereof coincides with the axis of the rebar (20). ). Wherein said fixing member is characterized in that the a tubular sleeve (2) screwed into the bolt holes (25, 25) provided in the the bolts (7), claims 1
3. The mortar-filled rebar joint (1) according to any one of (3). 5. The fixing member is driven through a radial pin hole (24) provided in the tubular sleeve (2).
Tapered pin (23) that presses the rebar (20) at the tip
The mortar-filled rebar joint (1) according to any one of claims 1 to 3, wherein the leaf spring is a spring pin (26) obtained by rolling a leaf spring into a pin shape . 6. The fixing device according to claim 6, wherein the fixing member is the tubular sleeve.
Driving through the chordal pin holes (24) provided in (2)
Taper pin (23) for pressing the rebar (20) on the side peripheral surface
Or a spring pin (26) obtained by rolling a leaf spring into a pin shape.
The mortar-filled rebar joint (1) according to any one of claims 1 to 3 , characterized in that :